Gas Pixel Detectors. Ronaldo Bellazzini INFN - Pisa. 8th International Workshop on Radiation Imaging Detectors (IWORID-8) Pisa 2-6/july 2
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1 Gas Pixel Detectors Ronaldo Bellazzini INFN - Pisa 8th International Workshop on Radiation Imaging Detectors (IWORID-8) Pisa 2-6/july
2 Polarimetry: The Missing Piece of the Puzzle Imaging: Chandra Timing: RXTE Spectroscopy: AstroE2, Constellation-X, Chandra Polarimetry:?
3 The only polarized source already known Positive measurement: of X-ray X polarization of the Crab Nebula without pulsar contamination (by lunar occultation, Weisskopf et al., 1978). P = 19.2 ± 1.0 % θ = o ± 1.4 o p.s.f. But this is only the average measurement.the structure is much more complex! PSR NW jet SE jet Inner torus Outer torus f.o.v. With XPOL we can perform the separate polarimetry, imaging, spectroscopy and timing of details of the major structures
4 Photoelectric cross section The photoelectric effect is very sensitive to photon polarization! Simple analytical expression for photoemission differential cross section (k-shell photoelectron in non-relativistic limit): σ = Ω 2 r o Z mc ν h sin ( θ ) cos ( ϕ ) ( 1 β cos( θ )) 4 If we project on the plane orthogonal to the propagation direction σ 2 cos φ Ω
5 Photoelectron and Auger angular distributions Photoelectron emission angular distributions σ θ 3 sin ( θ ) ( 1 β cos( θ )) 4 σ 2 cos φ φ Auger emission directions Photoelectron emission directions
6 The principle of detection DRIFT PLANE Vdrift GEM electric field DRIFT REGION charge and/or trigger Auger electron photoelectron Vtop AMPLYFING GEM Vbottom CHARGE COLLECTION REGION PIXEL ANODE ADC A custom CMOS analog chip is at the same time the pixelized charge collecting electrode and the amplifying, shaping and charge measuring front-end electronics of Micropattern Gas Detectors (MPGD) or other suitable charge multiplier conversion gain collection 5 µs X photon (E) pixel GEM αe VLSI
7 2k, 0.35 µm 22k, 0.35 µm 105k, 0.18 µm, self-triggering three ASIC generations of increasing size, reduced pitch and improved functionality have been realized
8 The collecting anode/read read-out VLSI chip First ASIC prototype Advantages: asynchronous, fast, low noise pixel electronics dimension: 80 µm x 80 µm in an hexagonal array, comprehensive of preamplifier/shaper, S/H and routing (serial read-out) for each pixel number of pixels: 2101 ~3.5 µs shaping time 100 e- ENC 100 mv/fc input sensitivity 20 fc dynamic range
9 Tracks reconstruction 1) The track is recorded by the PIXel Imager 2) Baricenter evaluation 3) Reconstruction of the principal axis of the track: maximization of the second moment of charge distribution Real track 4) Reconstruction of the conversion point: major second moment (track length) + third moment along the principal axis (asymmetry of charge release) 5) Reconstruction of emission direction: pixels are weighted according to the distance from conversion point.
10 From 2k to 22k pixels
11
12 Further technological step: a 0.18 µm m CMOS VLSI The chip integrates more than 16.5 million transistors. It has a15mm a x 15mm active area of pixels organized in a honeycomb matrix 470 pixels/mm 2 Matrix organization 300 (width=300x50µm=15mm) x 352 (height=352x43.3µm=15.24mm) pixels 16 clusters of 300 x 22 = 6600 pixels each or 8 clusters of 300 x 44 = pixels each
13 0.18 µm m ASIC features Peaking time: µs, externally adjustable; Read-out clock: up to 10MHz; Frame rate: up to 10 khz in self-trigger mode (event window); Read-out mode: asynchronous or synchronous; Trigger mode: intenal,, external or self-trigger; Pixel noise: 50 electrons ENC; Self-trigger threshold: 2300 electrons; Full-scale linear range: electrons; Parallel analog output buffers: 1, 8 or 16; Access to pixel content: direct (single pixel) or serial (8-16 clusters, full matrix, region of interest); Fill fraction (ratio of metal area to active area): 92% Total power dissipation ~ 0.5 Watt
14 Self-trigger functionality Trigger shaping time ~1/2 pixel amplifier ST charge sum of mini-cluster of 4 pixels contribute to a local trigger with dedicated s.a. threshold < 3000 e - (10% FS) individual pixel trigger mask independent trigger level for each 16 clusters event localization in rectangle containing all triggered mini-clusters + user selectable region of 10 or 20 pixels the chip calculates the event ROI (X min,y min X max,y max ) for subsequent sequential readout of selected area Average window size ~700 pixels
15 Noise and threshold ENC ~50 e - Self-trigger threshold constrained by pedestal offset more than pedestal fluctuations Few 2300 e -
16 Detector assembly GEM pitch: 50 µm GEM holes diameters: 33 µm, 15 µm Read out pitch: 50 µm Absorption gap thickness: 10 mm Collection gap thickness: 1 mm The GEM glued to the bottom of the gas-tight enclosure 2 - The large area ASIC mounted on the control motherboard Large effective gas gain around in Ne(50%)-DME(50%) (at least 70 V less than in our standard 90 µm pitch GEM)
17 pitch: 50 µm holes inner outer Ø: µm GEM specs The matching of readout and gas amplification (GEM) pitch allows getting optimal results and to fully exploit the very high granularity of the device
18 The read-out system
19 On-line monitoring Real time pedestal subtraction
20 Imaging capability 55 Fe source Ne(50%)-DME(50%) Holes: 0.6 mm diameter, 2 mm apart.
21 Imaging and spectroscopic capability Argon (50%)-DME(50%) Signal from GEM top FWHM E/E KeV) ~18% FWHM Holes: Ø 0.5 mm pitch 1 mm
22 Polarizing X-raysX 90º Thompson scattering
23 Track morphology and angle reconstruction
24 Modulation factor Measured with two different gas mixtures: He/DME and kev Cr-line energy 51.11%± 0.89% 54.26% ± kev Fe energy
25 Residual modulation S/N ~200 Track asimmetry Residual modulation compatible with zero S/N distribution, scatter plot of the two principal axes of the cluster charge and residual modulation, obtained with 55 Fe source in Ne(50%)-DME(50%)
26 Expected MDP with XEUS different source fluxes and spectral index He(40%)-DME(60%) With observations of one day we can measure the polarization of several AGNs down to 1 % for 1 mcrab flux With 1 h it is possible to get few % with a 10 mcrab flux Ne(50%)-DME(50%)
27 Conclusions With devices like the one presented the class of Gas Pixel Detectors has reached the level of integration, compactness and resolving power typical of solid state detectors. Depending on type of electron multiplier, pixel and die size, electronics shaping time, analog vs. digital read-out, counting vs. integrating mode, many applications can be envisaged for this class of detectors. As for the X-ray polarimetry applications a residual modulation very low and a modulation factor well above 50% will likely allow polarimetric measurements at the level of ~1% for hundreds of galactic and extragalactic sources. A real breakthrough in X-ray astronomy if compared with the traditional X-ray polarimeters sensitivity.
28 An efficient photoelectric X-ray polarimeter for the study of black holes and neutron stars E. Costa, P. Soffitta, R. Bellazzini, A. Brez, N. Lumb, G. Spandre Nature, Vol. 411 (2001) 662.
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